1 | /*
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2 | * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | /* Dispatch functions for AES CBC CTS ciphers */
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11 |
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12 | #include <openssl/proverr.h>
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13 | #include "cipher_cts.h"
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14 |
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15 | #define CTS_FLAGS PROV_CIPHER_FLAG_CTS
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16 |
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17 | static OSSL_FUNC_cipher_encrypt_init_fn aes_cbc_cts_einit;
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18 | static OSSL_FUNC_cipher_decrypt_init_fn aes_cbc_cts_dinit;
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19 | static OSSL_FUNC_cipher_get_ctx_params_fn aes_cbc_cts_get_ctx_params;
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20 | static OSSL_FUNC_cipher_set_ctx_params_fn aes_cbc_cts_set_ctx_params;
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21 | static OSSL_FUNC_cipher_gettable_ctx_params_fn aes_cbc_cts_gettable_ctx_params;
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22 | static OSSL_FUNC_cipher_settable_ctx_params_fn aes_cbc_cts_settable_ctx_params;
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23 |
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24 | CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(aes_cbc_cts)
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25 | OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
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26 | CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(aes_cbc_cts)
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27 |
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28 | static int aes_cbc_cts_einit(void *ctx, const unsigned char *key, size_t keylen,
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29 | const unsigned char *iv, size_t ivlen,
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30 | const OSSL_PARAM params[])
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31 | {
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32 | if (!ossl_cipher_generic_einit(ctx, key, keylen, iv, ivlen, NULL))
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33 | return 0;
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34 | return aes_cbc_cts_set_ctx_params(ctx, params);
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35 | }
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36 |
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37 | static int aes_cbc_cts_dinit(void *ctx, const unsigned char *key, size_t keylen,
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38 | const unsigned char *iv, size_t ivlen,
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39 | const OSSL_PARAM params[])
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40 | {
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41 | if (!ossl_cipher_generic_dinit(ctx, key, keylen, iv, ivlen, NULL))
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42 | return 0;
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43 | return aes_cbc_cts_set_ctx_params(ctx, params);
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44 | }
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45 |
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46 | static int aes_cbc_cts_get_ctx_params(void *vctx, OSSL_PARAM params[])
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47 | {
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48 | PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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49 | OSSL_PARAM *p;
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50 |
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51 | p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE);
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52 | if (p != NULL) {
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53 | const char *name = ossl_cipher_cbc_cts_mode_id2name(ctx->cts_mode);
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54 |
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55 | if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) {
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56 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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57 | return 0;
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58 | }
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59 | }
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60 | return ossl_cipher_generic_get_ctx_params(vctx, params);
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61 | }
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62 |
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63 | CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(aes_cbc_cts)
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64 | OSSL_PARAM_utf8_string(OSSL_CIPHER_PARAM_CTS_MODE, NULL, 0),
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65 | CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(aes_cbc_cts)
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66 |
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67 | static int aes_cbc_cts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
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68 | {
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69 | PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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70 | const OSSL_PARAM *p;
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71 | int id;
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72 |
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73 | p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_CTS_MODE);
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74 | if (p != NULL) {
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75 | if (p->data_type != OSSL_PARAM_UTF8_STRING)
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76 | goto err;
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77 | id = ossl_cipher_cbc_cts_mode_name2id(p->data);
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78 | if (id < 0)
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79 | goto err;
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80 |
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81 | ctx->cts_mode = (unsigned int)id;
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82 | }
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83 | return ossl_cipher_generic_set_ctx_params(vctx, params);
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84 | err:
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85 | ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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86 | return 0;
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87 | }
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88 |
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89 | /* ossl_aes256cbc_cts_functions */
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90 | IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 256, 128, 128, block)
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91 | /* ossl_aes192cbc_cts_functions */
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92 | IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 192, 128, 128, block)
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93 | /* ossl_aes128cbc_cts_functions */
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94 | IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 128, 128, 128, block)
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